docs: def tuple_to_string(prog_tuple):
      """Create a string from tuples returned by parse_string."""
      (roman, acc, suff) = prog_tuple
      if acc > 6:
          acc = 0 - acc % 6
      elif acc < -6:
          acc = acc % 6
      while acc < 0:
          roman = 'b' + roman
          acc += 1
      while acc > 0:
          roman = '#' + roman
          acc -= 1
      return roman + suff